From 1e064f29139a45061a8082914e9ee75c15e803a4 Mon Sep 17 00:00:00 2001
From: Alejandro Soto <alejandro@34project.org>
Date: Wed, 22 Nov 2023 01:24:41 -0600
Subject: rtl/gfx: implement fp->fixed conversion

---
 tb/verilator.hpp | 10 ++++++++++
 1 file changed, 10 insertions(+)

(limited to 'tb')

diff --git a/tb/verilator.hpp b/tb/verilator.hpp
index ff2e9c0..282c7af 100644
--- a/tb/verilator.hpp
+++ b/tb/verilator.hpp
@@ -1,6 +1,7 @@
 #ifndef TALLER_VERILATOR_HPP
 #define TALLER_VERILATOR_HPP
 
+#include <cmath>
 #include <cstdint>
 
 namespace taller
@@ -30,6 +31,15 @@ namespace taller
 		q_bits.fp16 = a_bits.fp16 * b_bits.fp16;
 		return q_bits.u16;
 	}
+
+	static inline std::uint32_t fp_fix(std::uint16_t fp) noexcept
+	{
+		fp16_bits fp_bits;
+		fp_bits.u16 = fp;
+
+		auto as_double = std::ldexp(static_cast<double>(fp_bits.fp16), 16);
+		return static_cast<std::uint32_t>(static_cast<std::int32_t>(as_double));
+	}
 }
 
 #endif
-- 
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